Common information transmission method and apparatus

ABSTRACT

A common information transmission method and an apparatus relate to the communications field, and to reduce repeated sending of common information from a base station to a plurality of user equipments (UEs) during sending of the common information, and improve utilization of resources between the base station and the UEs. The method includes obtaining, by UE, frequency domain location information of a first transmission bandwidth, determining, by the UE, a size and a location of the first transmission bandwidth in a bandwidth of the UE according to the frequency domain location information, where the bandwidth of the UE is one of system bandwidths, and receiving, by the UE over the first transmission bandwidth according to the size and the location of the first transmission bandwidth, common information sent by a base station.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.15/661,824, filed on Jul. 27, 2017, which is a continuation ofInternational Patent Application No. PCT/CN2015/071667, filed on Jan.27, 2015. All of the aforementioned patent applications are herebyincorporated by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the communications field, and inparticular, to a common information transmission method and anapparatus.

BACKGROUND

In a Long Term Evolution (LTE) system, a base station exchangesinformation with user equipment (UE) using a time-frequency resource ina channel. Further, a frequency resource in the time-frequency resourcemay be allocated to the base station and the UE in a form of a bandwidth(BW), which is also referred to as a frequency band width, that is, adifference between a highest frequency and a lowest frequency that maybe used by a network signal. For example, after first UE is connected toa network, a base station allocates a 5 megahertz (MHz) system bandwidth(the system bandwidth refers to a bandwidth of UE that is alreadydefined in the LTE system) to the first UE, and the system bandwidth islocated on physical resource blocks (PRBs) numbered from 0 to 24.Therefore, the base station may send common information to the first UEover the system bandwidth of the first UE in order to interact with thefirst UE.

As shown in FIG. 1 , the common information may be a system informationblock (SIB), a random access response (RAR), paging information, orinformation transmitted on a channel such as a physical downlink controlchannel (PDCCH).

However, for different types of UEs, locations of bandwidths used by theUEs may overlap. For example, a bandwidth of first UE is a firstbandwidth (whose size is 5 MHz) of PRBs numbered from 0 to 24, abandwidth of second UE is a second bandwidth (whose size is 5 MHz) ofPRBs numbered from 10 to 34, and there is an overlapped 3 MHz bandwidthbetween them. Using an example in which a base station sends RARinformation to the UEs, in this case, the base station needs toseparately send, at a location of a specified RAR resource in the firstbandwidth, the RAR information to the first UE, and send, at a locationof a specified RAR resource in the second bandwidth, the RAR informationto the second UE. Consequently, a communication rate between the basestation and the UEs is affected, and signalling overheads of the basestation are increased.

SUMMARY

Embodiments of the present disclosure provide a common informationtransmission method and an apparatus to reduce repeated sending ofcommon information from a base station to multiple UEs during sending ofthe common information, and improve utilization of resources between thebase station and the UE.

To achieve the foregoing objective, the following technical solutionsare used in the embodiments of the present disclosure.

According to a first aspect, an embodiment of the present disclosureprovides a common information transmission method, including obtaining,by UE, frequency domain location information of a first transmissionbandwidth, determining, by the UE, a size and a location of the firsttransmission bandwidth in a bandwidth of the UE according to thefrequency domain location information, where the bandwidth of the UE isone of system bandwidths, and receiving, by the UE over the firsttransmission bandwidth according to the size and the location of thefirst transmission bandwidth, common information sent by a base station.

With reference to the first aspect, in a first possible implementationmanner of the first aspect, receiving, over the first transmissionbandwidth, common information sent by a base station includes receiving,by the UE over the first transmission bandwidth, first commoninformation sent by the base station, where the first common informationincludes information transmitted using a physical control formatindicator channel (PCFICH), a physical hybrid automatic repeat requestindicator channel (PHICH), a common PDCCH, or a common enhanced PDCCH(EPDCCH), or receiving, by the UE over the first transmission bandwidth,second common information sent by the base station, where the secondcommon information includes at least one of a SIB, a RAR, or paginginformation, or receiving, by the UE over the first transmissionbandwidth, third common information sent by the base station, where thethird common information includes at least one of a master informationblock (MIB), a primary synchronization signal (PSS), a secondarysynchronization signal (SSS), or a discovery reference signal (DRS).

With reference to the first aspect or the first possible implementationmanner of the first aspect, in a second possible implementation mannerof the first aspect, obtaining, by UE, frequency domain locationinformation of a first transmission bandwidth includes receiving, by theUE, the frequency domain location information that is of the firsttransmission bandwidth and that is semi-statically transmitted by thebase station, or extracting, by the UE, a characteristic signal from thefirst transmission bandwidth by means of blind detection in order todetermine the frequency domain location information of the firsttransmission bandwidth, where the characteristic signal is used toreflect the size and the location of the first transmission bandwidth.

With reference to any one of the first aspect or the first or the secondpossible implementation manner of the first aspect, in a third possibleimplementation manner of the first aspect, there is an overlapping partbetween the bandwidth of the UE and a bandwidth of at least one UE ofother UEs, and the first transmission bandwidth is all or a part of theoverlapping part.

With reference to any one of the first to the third possibleimplementation manners of the first aspect, in a fourth possibleimplementation manner of the first aspect, receiving, by the UE over thefirst transmission bandwidth according to the size and the location ofthe first transmission bandwidth, common information sent by a basestation includes receiving, by the UE, first location information thatis of the second common information and that is sent by the basestation, where the first location information is used to determine areceiving location of the second common information in the bandwidth ofthe UE, determining, by the UE, a first location of the second commoninformation according to the first location information and a firstoffset, where the first location is located in the first transmissionbandwidth, and the first offset is used to indicate a location offset ofthe first transmission bandwidth in the bandwidth of the UE, andreceiving, by the UE at the first location, the second commoninformation sent by the base station.

With reference to the fourth possible implementation manner of the firstaspect, in a fifth possible implementation manner of the first aspect,the method further includes determining, by the UE, the first offsetaccording to the frequency domain location information, or receiving, bythe UE, the first offset sent by the base station.

With reference to any one of the first to the third possibleimplementation manners of the first aspect, in a sixth possibleimplementation manner of the first aspect, receiving, by the UE over thefirst transmission bandwidth according to the size and the location ofthe first transmission bandwidth, common information sent by a basestation includes receiving, by the UE, second location information thatis of the second common information and that is sent by the basestation, where the second location information is used to indicate areceiving location of the second common information in the firsttransmission bandwidth, determining, by the UE, a second location of thesecond common information according to the second location informationof the second common information, where the second location is locatedin the first transmission bandwidth, and receiving, by the UE at thesecond location, the second common information sent by the base station.

With reference to any one of the first aspect or the first to the sixthpossible implementation manners of the first aspect, in a seventhpossible implementation manner of the first aspect, the size of thefirst transmission bandwidth is 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz,or 20 MHz.

With reference to any one of the first aspect or the first to theseventh possible implementation manners of the first aspect, in aneighth possible implementation manner of the first aspect, the methodfurther includes receiving, by the UE, information that is about asecond offset and that is sent by the base station, where the secondoffset is used to indicate a location offset that is of a frequencydomain location used to transmit uplink information and that is in thebandwidth of the UE, determining, by the UE according to a resourcelocation at which the common information is received and the informationabout the second offset, an uplink resource location at which the UEsends the uplink information to the base station, and sending, by the UEat the uplink resource location, the uplink information to the basestation.

According to a second aspect, an embodiment of the present disclosureprovides a common information transmission method, includingdetermining, by a base station, a size and a location of a firsttransmission bandwidth in a bandwidth of the base station, and sending,by the base station, common information to UE over the firsttransmission bandwidth according to the size and the location of thefirst transmission bandwidth in the bandwidth of the base station.

With reference to the second aspect, in a first possible implementationmanner of the second aspect, sending, by the base station, commoninformation to UE over the first transmission bandwidth includessending, by the base station, first common information to the UE overthe first transmission bandwidth, where the first common informationincludes information transmitted using a PCFICH, a PHICH, a commonPDCCH, or a common EPDCCH, or sending, by the base station, secondcommon information to the UE over the first transmission bandwidth,where the second common information includes at least one of an SIB, anRAR, or paging information, or sending, by the base station, thirdcommon information to the UE over the first transmission bandwidth,where the third common information includes at least one of an MIB, aPSS, an SSS, or a DRS.

With reference to the second aspect or the first possible implementationmanner of the second aspect, in a second possible implementation mannerof the second aspect, after determining, by a base station, a size and alocation of a first transmission bandwidth in a bandwidth of the basestation, the method further includes semi-statically transmitting, bythe base station, frequency domain location information to the UE, wherethe frequency domain location information is used to determine a sizeand a location of the first transmission bandwidth in a bandwidth of theUE, or sending, by the base station, a characteristic signal to the UE,where the characteristic signal is used to determine a size and alocation of the first transmission bandwidth in a bandwidth of the UE.

With reference to any one of the second aspect or the first or thesecond possible implementation manner of the second aspect, in a thirdpossible implementation manner of the second aspect, there is anoverlapping part between the bandwidth of the UE and a bandwidth of atleast one UE of other UEs, and the first transmission bandwidth is allor a part of the overlapping part.

With reference to the first possible implementation manner of the secondaspect, in a fourth possible implementation manner of the second aspect,sending, by the base station, second common information to the UE overthe first transmission bandwidth includes sending, by the base station,first location information to the UE, where the first locationinformation is used to determine a first location of the second commoninformation, and the first location is located in the first transmissionbandwidth, and sending, by the base station, the second commoninformation to the UE according to the first location.

With reference to the first possible implementation manner of the secondaspect, in a fifth possible implementation manner of the second aspect,sending, by the base station, second common information to UE over thefirst transmission bandwidth includes sending, by the base station,second location information to the UE, where the second locationinformation is used to indicate a second location of the second commoninformation in the first transmission bandwidth, and sending, by thebase station, the second common information to the UE according to thesecond location.

With reference to any one of the second aspect or the first to the fifthpossible implementation manners of the second aspect, in a sixthpossible implementation manner of the second aspect, the size of thefirst transmission bandwidth is 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz,or 20 MHz.

With reference to any one of the second aspect or the first to the sixthpossible implementation manners of the second aspect, in a seventhpossible implementation manner of the second aspect, after sending, bythe base station, common information to UE over the first transmissionbandwidth, the method further includes sending, by the base station,information about a second offset to the UE, where the second offset isused to indicate a location offset that is of a frequency domainlocation used to transmit uplink information and that is in thebandwidth of the UE.

According to a third aspect, an embodiment of the present disclosureprovides UE, including a processing unit configured to obtain frequencydomain location information of a first transmission bandwidth, anddetermine a size and a location of the first transmission bandwidth in abandwidth of the UE according to the frequency domain locationinformation, where the bandwidth of the UE is one of system bandwidths,and a receiving unit configured to receive, over the first transmissionbandwidth according to the size and the location of the firsttransmission bandwidth that are determined by the processing unit,common information sent by a base station.

With reference to the third aspect, in a first possible implementationmanner of the third aspect, the common information includes at least oneof the common information, first common information, second commoninformation, or third common information, where the first commoninformation includes information transmitted using a PCFICH, a PHICH, acommon PDCCH, or a common EPDCCH, or the second common informationincludes at least one of an SIB, an RAR, or paging information, or thethird common information includes at least one of an MIB, a PSS, an SSS,or a DRS.

With reference to the third aspect or the first possible implementationmanner of the third aspect, in a second possible implementation mannerof the third aspect, the receiving unit is further configured to receivethe frequency domain location information that is of the firsttransmission bandwidth and that is semi-statically transmitted by thebase station, and the processing unit is further configured to obtainthe frequency domain location information of the first transmissionbandwidth using the receiving unit, or the receiving unit is furtherconfigured to extract a characteristic signal from the firsttransmission bandwidth by means of blind detection, and the processingunit is further configured to determine the frequency domain locationinformation of the first transmission bandwidth according to thecharacteristic signal in the receiving unit, where the characteristicsignal is used to reflect the size and the location of the firsttransmission bandwidth.

With reference to any one of the third aspect or the first or the secondpossible implementation manner of the third aspect, in a third possibleimplementation manner of the third aspect, there is an overlapping partbetween the bandwidth of the UE and a bandwidth of at least one UE ofother UEs, and the first transmission bandwidth is all or a part of theoverlapping part.

With reference to any one of the third aspect or the first to the thirdpossible implementation manners of the third aspect, in a fourthpossible implementation manner of the third aspect, the receiving unitis further configured to receive first location information that is ofthe second common information and that is sent by the base station,where the first location information is used to determine a receivinglocation of the second common information in the bandwidth of the UE,the processing unit is further configured to determine a first locationof the second common information according to the first locationinformation and a first offset, where the first location is located inthe first transmission bandwidth, and the first offset is used toindicate a location offset of the first transmission bandwidth in thebandwidth of the UE, and the receiving unit is further configured toreceive, at the first location, the second common information sent bythe base station.

With reference to the fourth possible implementation manner of the thirdaspect, in a fifth possible implementation manner of the third aspect,the receiving unit is further configured to receive the first offsetsent by the base station.

With reference to the fourth possible implementation manner of the thirdaspect, in a sixth possible implementation manner of the third aspect,the processing unit is further configured to determine the first offsetaccording to the frequency domain location information.

With reference to any one of the third aspect or the first to the thirdpossible implementation manners of the third aspect, in a seventhpossible implementation manner of the third aspect, the receiving unitis further configured to receive second location information that is ofthe second common information and that is sent by the base station,where the second location information is used to indicate a receivinglocation of the second common information in the first transmissionbandwidth. The processing unit is further configured to determine asecond location of the second common information according to the secondlocation information of the second common information, where the secondlocation is located in the first transmission bandwidth, and thereceiving unit is further configured to receive, at the second location,the second common information sent by the base station.

With reference to any one of the third aspect or the first to theseventh possible implementation manners of the third aspect, in aneighth possible implementation manner of the third aspect, the receivingunit is further configured to receive information that is about a secondoffset and that is sent by the base station, where the second offset isused to indicate a location offset that is of a frequency domainlocation used to transmit uplink information and that is in thebandwidth of the UE. The processing unit is further configured todetermine, according to a resource location at which the commoninformation is received and the information about the second offset, anuplink resource location at which the UE sends the uplink information tothe base station, and the UE further includes a sending unit configuredto send the uplink information at the uplink resource location.

According to a fourth aspect, an embodiment of the present disclosureprovides a base station, including a processing unit configured todetermine a size and a location of a first transmission bandwidth in abandwidth of the base station, and a sending unit configured to sendcommon information to UE over the first transmission bandwidth accordingto the size and the location of the first transmission bandwidth in thebandwidth of the base station that are determined by the processingunit.

With reference to the fourth aspect, in a first possible implementationmanner of the fourth aspect, the common information includes at leastone of the following common information first common information, secondcommon information, or third common information, where the first commoninformation includes information transmitted using a PCFICH, a PHICH, acommon PDCCH, or a common EPDCCH, or the second common informationincludes at least one of an SIB, an RAR, or paging information, or thethird common information includes at least one of an MIB, a PSS, an SSS,or a DRS.

With reference to the fourth aspect or the first possible implementationmanner of the fourth aspect, in a second possible implementation mannerof the fourth aspect, the sending unit is further configured tosemi-statically transmit frequency domain location information to theUE, where the frequency domain location information is used to determinea size and a location of the first transmission bandwidth in a bandwidthof the UE, or the sending unit is further configured to send acharacteristic signal to the UE, where the characteristic signal is usedto determine a size and a location of the first transmission bandwidthin a bandwidth of the UE.

With reference to any one of the fourth aspect or the first or thesecond possible implementation manner of the fourth aspect, in a thirdpossible implementation manner of the fourth aspect, there is anoverlapping part between the bandwidth of the UE and a bandwidth of atleast one UE of other UEs, and the first transmission bandwidth is allor a part of the overlapping part.

With reference to the second possible implementation manner of thefourth aspect, in a fourth possible implementation manner of the fourthaspect, the sending unit is further configured to send first locationinformation to the UE, where the first location information is used todetermine a first location of the second common information. Theprocessing unit is further configured to determine the first locationaccording to the first location information and a first offset, wherethe first location is located in the first transmission bandwidth, andthe first offset is used to indicate a location offset of the firsttransmission bandwidth in the bandwidth of the UE, and the sending unitis further configured to send the second common information to the UEaccording to the first location.

With reference to the second possible implementation manner of thefourth aspect, in a fifth possible implementation manner of the fourthaspect, the sending unit is further configured to send second locationinformation to the UE, where the second location information is used toindicate a second location of the second common information in the firsttransmission bandwidth. The processing unit is further configured todetermine the second location according to the second locationinformation, where the second location is located in the firsttransmission bandwidth, and the sending unit is further configured tosend the second common information to the UE according to the secondlocation.

With reference to any one of the fourth aspect or the first to the fifthpossible implementation manners of the fourth aspect, in a sixthpossible implementation manner of the fourth aspect, the sending unit isfurther configured to send information about a second offset to the UE,where the second offset is used to indicate a location offset that is ofa frequency domain location used to transmit uplink information and thatis in the bandwidth of the UE.

In common information transmission method and the apparatus that areprovided in the embodiments of the present disclosure, UE obtainsfrequency domain location information of a first transmission bandwidth,and determines a size and a location of the first transmission bandwidthin a bandwidth of the UE, and then a base station sends commoninformation to the UE over the first transmission bandwidth. In thisway, when the first transmission bandwidth is located in an overlappingpart of bandwidths of multiple UEs, the base station may deliver thecommon information to the multiple UEs at once. That is, the basestation may send the common information to the multiple UEs at the sametime in a sharing manner, thereby avoiding problems that because thebase station needs to separately send the common information to each UE,a communication rate is decreased and signalling overheads of the basestation are increased.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentdisclosure more clearly, the following briefly describes theaccompanying drawings required for describing the embodiments.

FIG. 1 is a schematic diagram of a transmitting location of commoninformation in a bandwidth of UE;

FIG. 2 is a first schematic flowchart of a common informationtransmission method according to an embodiment of the presentdisclosure;

FIG. 3 is a schematic diagram of bandwidth locations of a base station,first UE, and second UE according to an embodiment of the presentdisclosure;

FIG. 4 is a second schematic flowchart of a common informationtransmission method according to an embodiment of the presentdisclosure;

FIG. 5 is a third schematic flowchart of a common informationtransmission method according to an embodiment of the presentdisclosure;

FIG. 6 is a first schematic structural diagram of UE according to anembodiment of the present disclosure;

FIG. 7 is a second schematic structural diagram of UE according to anembodiment of the present disclosure; and

FIG. 8 is a schematic structural diagram of a base station according toan embodiment of the present disclosure.

DESCRIPTION OF EMBODIMENTS

The following clearly describes the technical solutions in theembodiments of the present disclosure with reference to the accompanyingdrawings in the embodiments of the present disclosure. The describedembodiments are merely some but not all of the embodiments of thepresent disclosure.

Embodiment 1

This embodiment of the present disclosure provides a common informationtransmission method. As shown in FIG. 2 , the method includes thefollowing steps.

Step 101: UE obtains frequency domain location information of a firsttransmission bandwidth.

Step 102: The UE determines a size and a location of the firsttransmission bandwidth in a bandwidth of the UE according to thefrequency domain location information.

Step 103: The UE receives, over the first transmission bandwidthaccording to the size and the location of the first transmissionbandwidth, common information sent by a base station.

The common information used in this embodiment of the present disclosuremay be classified into three types. Common information sent by the basestation over an entire bandwidth of the UE is first common information,such as information transmitted using a PCFICH, a PHICH, a common PDCCH,or a common EPDCCH. Common information sent by the base station over apart of the bandwidth after the base station dynamically performsresource configuration in the entire bandwidth of the UE is secondcommon information, such as an SIB, an RAR, or paging information. Inaddition, common information sent by the base station over a bandwidthat a specified location in the entire bandwidth of the UE is thirdcommon information, such as an MIB, a PSS, an SSS, or a DRS.

Further, an LTE system has already defined that there are six sizes fora standard bandwidth (also referred to as a system bandwidth) of UE,that is, 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. However, abandwidth used on a side of a base station is not equivalent to abandwidth used by UE. The bandwidth used on the side of the base stationmay be a non-standard or standard bandwidth. In some cases, differentbandwidths used by multiple UEs may overlap. For example, as shown inFIG. 3 , a bandwidth used by a base station is a 7 MHz non-standardbandwidth. The 7 MHz bandwidth may be divided into two 5 MHz standardbandwidths. The two 5 MHz standard bandwidths are respectively standardbandwidths used by first UE and second UE, and there is a 3 MHzoverlapping bandwidth between the two bandwidths.

When the base station needs to deliver the common information (that is,the first common information, the second common information, or thethird common information) to the first UE and the second UE, becauselocations of system bandwidths used by the first UE and the second UEare different, the base station needs to separately deliver the samecommon information to the first UE and the second UE. Consequently, acommunication rate between the base station and the UE is affected, andsignalling overheads of the base station are increased. In addition,when using a resource in the overlapping bandwidth to provide a servicefor the first UE, the base station cannot use the same resource toprovide a service for the second UE. In this case, a cell correspondingto a second bandwidth used by the second UE can be used only as asecondary serving cell, and the cell can serve the second UE only whencooperating with another carrier. Consequently, communicationperformance between the UE and the base station is affected.

In this embodiment of the present disclosure, a quantity of UEs may beN, where N=1, or N=2, or N=3, or N≥2. When N=2 or N≥2, bandwidths of atleast two UEs partially overlap, and the two UEs separately use twodifferent bandwidths or different carriers. In this case, all or a partof an overlapping bandwidth may be used to transmit the commoninformation to the at least two UEs such that the base station may send,in a sharing manner, the common information to the at least two UEswhose bandwidths partially overlap, thereby reducing overheads.

Therefore, by means of the common information transmission method,repeated sending of common information from a base station to multipleUEs during sending of the common information is reduced, and utilizationof resources between the base station and the UEs is improved.

In step 101, the UE obtains the frequency domain location information ofthe first transmission bandwidth. The first transmission bandwidth maybe M PRBs in the bandwidth of the UE, and the frequency domain locationinformation is used to indicate the location and the size of the firsttransmission bandwidth, where M>0.

The size of the first transmission bandwidth is less than a size of thebandwidth of the UE (that is, the first transmission bandwidth islocated in the bandwidth of the UE). Further, the first transmissionbandwidth may be predefined between the UE and the base station, or maybe configured by the base station. For example, the UE may receive thefrequency domain location information that is of the first transmissionbandwidth and that is semi-statically transmitted by the base station,or the UE may extract a characteristic signal from the firsttransmission bandwidth by means of blind detection in order to determinethe frequency domain location information of the first transmissionbandwidth. The characteristic signal may include multiple differentsignals. For example, when a predefined sequence is transmitted on atime-frequency resource unit in two ends of the first transmissionbandwidth, the location and the size of the first transmission bandwidthcan be obtained as long as the UE detects a location of the sequence.The present disclosure does not limit a specific form of thecharacteristic signal.

Optionally, the first transmission bandwidth may be formed by Mconsecutive PRBs overlapping between the bandwidth of the first UE andthe bandwidth of the second UE. The first UE and the second UE are UEsoccupying different frequency domain locations.

In step 102, after obtaining the frequency domain location informationof the first transmission bandwidth, the UE determines the size and thelocation of the first transmission bandwidth in the bandwidth of the UEaccording to the frequency domain location information.

Because in step 101, the location of the first transmission bandwidthmay be a start location of the first transmission bandwidth in thebandwidth of the UE, or may be an end location of the first transmissionbandwidth in the bandwidth of the UE, and the size of the firsttransmission bandwidth may be several consecutive PRBs, the UE maydetermine the size and the location of the first transmission bandwidthin the bandwidth of the UE according to the size and the location of thefirst transmission bandwidth in the frequency domain locationinformation.

For example, still using the first UE and the second UE in FIG. 3 as anexample, after obtaining the frequency domain location information ofthe first transmission bandwidth, the first UE determines, according tothe frequency domain location information, 15 consecutive PRBs from the10^(th) PRB to the 24^(th) PRB in the standard bandwidth of the first UEas a location of the first transmission bandwidth in the standardbandwidth of the first UE. After obtaining the frequency domain locationinformation of the first transmission bandwidth, the second UEdetermines, according to the frequency domain location information, 15consecutive PRBs from the 0^(th) to the 14^(th) PRBs in the standardbandwidth of the second UE as a location of the first transmissionbandwidth in the standard bandwidth of the second UE.

It may be seen that the standard bandwidths of the first UE and thesecond UE both include the first transmission bandwidth, but the firsttransmission bandwidth is located in different locations in therespective standard bandwidths of the first UE and the second UE. Inaddition, a bandwidth used by the base station may be a non-standardbandwidth or a standard bandwidth, and a bandwidth used by the UE mayalso be a standard bandwidth or a non-standard bandwidth. The presentdisclosure is described only using an example in which the base stationuses a non-standard bandwidth and the UE uses a standard bandwidth. Itmay be understood that three other cases that are not shown are alsoapplicable to the common information transmission method provided in thepresent disclosure.

Further, the first transmission bandwidth may be of any size and at anylocation. For example, the size of the first transmission bandwidth is 3MHz, 1.4 MHz, 2 MHz, or the like, or the size of the first transmissionbandwidth may use a PRB as a unit. For example, the size of the firsttransmission bandwidth is 15 PRBs, 6 PRBs, 8 PRBs, or the like.Correspondingly, the location of the first transmission bandwidth may beat a center, a left side, a right side, left of the center, or right ofthe center of the standard bandwidth of the UE.

Preferably, the size of the first transmission bandwidth may be astandard bandwidth already defined in the LTE system, that is, 1.4 MHz,3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz. Preferably, a frequency domainstructure of the first transmission bandwidth may be the same as afrequency domain structure of a bandwidth having a size the same as thesize of the first transmission bandwidth in the LTE system. In this way,the base station does not need to modify an existing configurationparameter for the UE, and even, the UE may be directly connected to theLTE system over the first transmission bandwidth such that the UE candirectly serve the UE over the first transmission bandwidth, therebyimproving compatibility of the LTE system.

In step 103, after determining the size and the location of the firsttransmission bandwidth in the bandwidth of the UE, the UE receives, overthe first transmission bandwidth, the common information sent by thebase station. The common information may be information shared bydifferent UEs occupying the first transmission bandwidth.

Still using the first UE and the second UE in FIG. 3 as an example,after separately determining sizes and locations of the firsttransmission bandwidth in respective bandwidths of the first UE and thesecond UE, the first UE and the second UE both receives, over the firsttransmission bandwidth, common information sent by the base station. Thecommon information may be any one or more of the foregoing first commoninformation, the second common information, or the third commoninformation. In this way, the base station may deliver the commoninformation at once, thereby avoiding problems that because the basestation separately sends the common information to each UE, acommunication rate is decreased and signalling overheads of the basestation are increased. In addition, because the first transmissionbandwidth is configured in each UE to receive the common informationsent by the base station, no conflict occurs between bandwidth resourcesused by the UEs, and the base station may separately serve each UE (thatis, standalone), thereby improving communication performance between thebase station and the UEs.

In addition, when receiving, over the first transmission bandwidth, thesecond common information sent by the base station, the UE maydynamically configure, over the first transmission bandwidth, areceiving location at which the second common information is received.For example, this embodiment of the present disclosure provides twomethods for receiving the second common information.

Further, after determining the size and the location of the firsttransmission bandwidth in the bandwidth of the UE, the UE may determinea first offset of the first transmission bandwidth according to thelocation of the first transmission bandwidth in the frequency domainlocation information and the size of the bandwidth of the UE. The firstoffset is used to indicate a location offset of the first transmissionbandwidth in the bandwidth of the UE.

For example, if the size of the standard bandwidth of the UE is 5 MHz(that is, PRBs numbered from 0 to 24), and the location of the firsttransmission bandwidth in the standard bandwidth of the UE is from the10^(th) PRB to the 24^(th) PRB, the first offset is 10 (that is,10−0=10) PRBs.

In this way, when the UE receives, over the first transmissionbandwidth, first location information sent by the base station, becausethe resource location information may be used to determine a receivinglocation of the second common information in the bandwidth of the UE,the UE may determine, according to the first location information andthe first offset, a first location of the second common information inthe bandwidth of the UE.

For example, if the first location information sent by the base stationindicates that the base station sends the second common information onthe 0^(th) to the 2^(nd) PRBs of the first transmission bandwidth, andthe first offset of the UE is 10 PRBs, the first location (that is, anactual receiving location in the bandwidth of the UE) of the secondcommon information in the bandwidth of the UE is the 10^(th) to the12^(th) PRBs in the bandwidth of the UE such that the UE may receive, atthe first location (that is, the 10^(th) to the 12^(th) PRBs) in thebandwidth of the UE, the second common information sent by the basestation.

The first location information may be information shared by UEsreceiving the second common information, or the resource locationinformation may be information sent to all UEs receiving the secondcommon information.

In another method for receiving the second common information providedin this embodiment of the present disclosure, before receiving thesecond common information, the UE may perform resource division over thefirst transmission bandwidth based on a resource granularity of a givensize according to a requirement. In this way, the UE may directlyreceive second location information that is of the second commoninformation and that is sent by the base station. Because the secondlocation information is used to indicate a receiving location of thesecond common information in the first transmission bandwidth, but not alocation of the second common information in the entire bandwidth of theUE, the UE may directly determine a second location of the second commoninformation in the first transmission bandwidth according to the secondlocation information in order to receive, at the second receivinglocation, the second common information sent by the base station.

Further, after receiving, over the first transmission bandwidth, thecommon information sent by the base station, the UE may also sendcorresponding uplink information to the base station.

Because a resource used by the UE to receive the common information(that is, downlink information) sent by the base station and a resourceused by the UE to send the uplink information to the base station needto satisfy a particular mapping relationship (for example, if the UEuses the X^(th) PRB to receive the downlink information, the UE uses the(X+Y)^(th) PRB to send the corresponding uplink information, where X andY are integers. It should be noted that the mapping relationship is notlimited thereto, and this is not limited in the present disclosure.),when UE that receives the downlink information over the firsttransmission bandwidth and UE that does not receive the downlinkinformation over the first transmission bandwidth send the uplinkinformation, a conflict may occur between bandwidth resources (that is,uplink resource locations).

In this case, the UE may determine a second offset according toinformation that is about the second offset and that is sent by the basestation, where the second offset is used to determine a relativelocation that is of a frequency domain location used to transmit theuplink information and that is in the bandwidth of the UE. Then the UEmay determine, according to a resource location of the received commoninformation and the second offset, an uplink resource location at whichthe uplink information is sent to the base station. Finally, the UE maysend the uplink information to the base station at the uplink resourcelocation. In this way, multiple UEs that receive the second commoninformation over the first transmission bandwidth may determine,according to different second offsets, uplink resource locations usedfor sending respective uplink information of the multiple UEs, therebyensuring that no conflict occurs between uplink resource locations usedby various types of UEs to send respective uplink information of the UEsto the base station.

In the common information transmission method provided in thisembodiment of the present disclosure, UE obtains frequency domainlocation information of a first transmission bandwidth, and determines asize and a location of the first transmission bandwidth in a bandwidthof the UE, and then a base station sends common information to the UEover the first transmission bandwidth. In this way, when the firsttransmission bandwidth is located in an overlapping part of bandwidthsof multiple UEs, the base station may deliver the common information tothe multiple UEs at once. That is, the base station may send the commoninformation to the multiple UEs at the same time in a sharing manner,thereby avoiding problems that because the base station needs toseparately send the common information to each UE, a communication rateis decreased and signalling overheads of the base station are increased.

Embodiment 2

This embodiment of the present disclosure provides a common informationtransmission method. As shown in FIG. 4 , the method includes thefollowing steps.

Step 201: A base station determines a size and a location of a firsttransmission bandwidth in a bandwidth of the base station.

Step 202: The base station sends, according to the size and the locationof the first transmission bandwidth in the bandwidth of the basestation, common information to UE over the first transmission bandwidth.

Similar to step 101 to step 103 in the foregoing embodiment, the commoninformation used in this embodiment of the present disclosure alsoincludes first common information transmitted using a PCFICH, a PHICH, acommon PDCCH, or a common EPDCCH, or second common information, such asat least one of an SIB, an RAR, or paging information, sent over a partof a bandwidth after the base station dynamically performs resourceconfiguration in the entire bandwidth of the UE, or third commoninformation, such as an MIB, a PSS, an SSS, or a DRS, sent by the basestation over a bandwidth at a specified location in the entire bandwidthof the UE.

In step 201, before delivering the common information to the UE, thebase station needs to determine the size and the location of the firsttransmission bandwidth in the bandwidth of the base station. Forexample, a bandwidth used by the base station is a 7 MHz non-standardbandwidth, and the first transmission bandwidth is located on the14^(th) PRB to the 24^(th) PRB in the 7 MHz non-standard bandwidth, andis totally 2 MHz.

Further, the base station determines frequency domain locationinformation of the first transmission bandwidth, where the frequencydomain location information is used to indicate a size and a location ofthe first transmission bandwidth in the bandwidth of the UE. In thisway, the base station may semi-statically transmit the frequency domainlocation information to the UE such that the UE determines the size andthe location of the first transmission bandwidth in the bandwidth of theUE according to the frequency domain location information, and the basestation sends the common information to the UE over the firsttransmission bandwidth.

Alternatively, the base station may also send a characteristic signal tothe UE such that the UE may perform blind detection according to thecharacteristic signal, and the UE finally determines the size and thelocation of the first transmission bandwidth in the bandwidth of the UEaccording to a result of the blind detection such that the base stationsends the common information to the UE over the first transmissionbandwidth.

The size of the first transmission bandwidth is less than a size of thebandwidth of the UE (that is, the first transmission bandwidth islocated in the bandwidth of the UE). In this embodiment of the presentdisclosure, a quantity of UEs may be N, where N=1, or N=2, or N=3, orN≥2. When N=2 or N≥2, bandwidths of at least two UEs partially overlap,and the two UEs separately use two different bandwidths or differentcarriers. In this case, all or a part of an overlapping bandwidth may beused to transmit the common information to the at least two UEs suchthat the base station may send, in a sharing manner, the commoninformation to the at least two UEs whose bandwidths partially overlap,thereby reducing overheads.

Further, the first transmission bandwidth may be of any size and at anylocation. For example, the size of the first transmission bandwidth is 3MHz, 1.4 MHz, 2 MHz, or the like, or the size of the first transmissionbandwidth may use a PRB as a unit. For example, the size of the firsttransmission bandwidth is 15 PRBs, 6 PRBs, 8 PRBs, or the like.Correspondingly, the location of the first transmission bandwidth may beat a center, a left side, a right side, left of the center, or right ofthe center of the standard bandwidth of the UE.

Preferably, the size of the first transmission bandwidth may be astandard bandwidth already defined in the LTE system, that is, 1.4 MHz,3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz. Preferably, a frequency domainstructure of the first transmission bandwidth may also be the same as afrequency domain structure of a bandwidth having a size the same as thesize of the first transmission bandwidth in the LTE system. In this way,the base station does not need to modify an existing configurationparameter for the UE, and even, the UE may be directly connected to theLTE system over the first transmission bandwidth such that the UE maydirectly serve the UE over the first transmission bandwidth, therebyimproving compatibility of the LTE system.

In step 202, after the UE determines the size and the location of thefirst transmission bandwidth in the bandwidth of the UE according to thefrequency domain location information, the base station sends the commoninformation (the first common information, the second commoninformation, or the third common information) to the UE over the firsttransmission bandwidth at the same time. Herein, there may be multipleUEs.

Further, using first UE and second UE in FIG. 3 as an example, afterseparately determining sizes and locations of the first transmissionbandwidth in respective bandwidths of the first UE and the second UE,the first UE and the second UE both receive, over the first transmissionbandwidth, the common information sent by the base station. In this way,the base station may deliver the common information to the first UE andthe second UE at once, thereby avoiding problems that because the basestation separately sends the common information to each UE, acommunication rate is decreased and signalling overheads of the basestation are increased. In addition, because the first transmissionbandwidth is configured in each UE to receive the common informationsent by the base station, no conflict occurs between bandwidth resourcesused by the UEs, and the base station may separately serve each UE,thereby improving communication performance between the base station andthe UEs.

In addition, when sending the second common information to multiple UEsover the first transmission bandwidth, the base station may dynamicallyconfigure, over the first transmission bandwidth, a bandwidth locationat which the UE receives the second common information. For example,this embodiment of the present disclosure provides two methodsconfigured by the base station for the UE to receive the second commoninformation.

In a first method, after determining the size and the location of thefirst transmission bandwidth in the bandwidth of the UE, the UE maydetermine a first offset of the first transmission bandwidth accordingto the location of the first transmission bandwidth and a size of thebandwidth of the UE. The first offset is used to indicate a locationoffset of the first transmission bandwidth in the bandwidth of the UE.For example, if the size of the standard bandwidth of the UE is 5 MHz(that is, PRBs numbered from 0 to 24), and the location of the firsttransmission bandwidth in the standard bandwidth of the UE is from the10^(th) PRB to the 24^(th) PRB, the first offset is 10 PRBs.

In this way, the base station may send first location information to theUE such that the UE determines, according to the first locationinformation and the first offset that is already determined by the UE, afirst location at which the second common information is received in thebandwidth of the UE. Therefore, the base station may send the secondcommon information to the UE at the first receiving location.

For example, if the first location information sent by the base stationindicates that the base station sends the second common information onthe 0^(th) to the 2^(nd) PRBs of the first transmission bandwidth, andthe first offset of the UE is 10 PRBs, the first location of the secondcommon information in the bandwidth of the UE is the 10^(th) to the12^(th) PRBs in the bandwidth of the UE such that the UE may receive, atthe first location (that is, the 10^(th) to the 12^(th) PRBs) in thebandwidth of the UE, the second common information sent by the basestation.

The first location information may be information shared by UEsreceiving the second common information, or the first locationinformation may be information sent to all UEs receiving the secondcommon information.

In another method for receiving the second common information providedin this embodiment of the present disclosure, before receiving thesecond common information, the UE may perform resource division over thefirst transmission bandwidth based on a resource granularity of a givensize according to a requirement. In this way, the UE may directlyreceive second location information that is of the second commoninformation and that is sent by the base station. Because the secondlocation information is used to indicate a location of the second commoninformation in the first transmission bandwidth, but not a location ofthe second common information in the entire bandwidth of the UE, the UEmay directly determine a second receiving location of the second commoninformation in the first transmission bandwidth according to the secondlocation information in order to receive, at the first receivinglocation, the second common information sent by the base station.

Further, after receiving, over the first transmission bandwidth, thecommon information sent by the base station, the UE may also sendcorresponding uplink information to the base station.

Because a resource used by the UE to receive the common information(that is, downlink information) sent by the base station and a resourceused by the UE to send the uplink information to the base station needto satisfy a particular mapping relationship, (for example, if the UEuses the X^(th) PRB to receive the downlink information, the UE uses the(X+Y)^(th) PRB to send the corresponding uplink information, where X andY are integers. It should be noted that the mapping relationship is notlimited thereto, and this is not limited in the present disclosure),when UE that receives the downlink information over the firsttransmission bandwidth and UE that does not receive the downlinkinformation over the first transmission bandwidth send the uplinkinformation, a conflict may occur between bandwidth resources (that is,uplink resource locations).

In this case, the UE may determine a second offset according toinformation that is about the second offset and that is sent by the basestation, where the second offset is used to determine a relativelocation that is of a frequency domain location used to transmit theuplink information and that is in the bandwidth of the UE. Then the UEmay determine, according to a resource location of the received commoninformation and the second offset, an uplink resource location at whichthe uplink information is sent to the base station. Finally, the UE maysend the uplink information to the base station at the uplink resourcelocation. In this way, multiple UEs that receive the second commoninformation over the first transmission bandwidth may determine,according to different second offsets, uplink resource locations usedfor sending respective uplink information of the multiple UEs, therebyensuring that no conflict occurs between uplink resource locations usedby various types of UEs to send respective uplink information of the UEsto the base station.

In the common information transmission method provided in thisembodiment of the present disclosure, UE obtains frequency domainlocation information of a first transmission bandwidth, and determines asize and a location of the first transmission bandwidth in a bandwidthof the UE, and then a base station sends common information to the UEover the first transmission bandwidth. In this way, when the firsttransmission bandwidth is located in an overlapping part of bandwidthsof multiple UEs, the base station may deliver the common information tothe multiple UEs at once. That is, the base station may send the commoninformation to the multiple UEs at the same time in a sharing manner,thereby avoiding problems that because the base station needs toseparately send the common information to each UE, a communication rateis decreased and signalling overheads of the base station are increased.

Embodiment 3

This embodiment of the present disclosure provides a common informationtransmission method. As shown in FIG. 5 , the method includes thefollowing steps.

Step 301: First UE obtains frequency domain location information of afirst transmission bandwidth, where the first transmission bandwidth isformed by M consecutive PRBs overlapping between a bandwidth of thefirst UE and a bandwidth of second UE, and M>0.

Step 302: The first UE determines a size and a location of the firsttransmission bandwidth in the bandwidth of the first UE according to thefrequency domain location information.

Step 303: The first UE receives, over the first transmission bandwidth,first common information or third common information sent by a basestation, where the first common information or the third commoninformation is information shared by the first UE and the second UE.

Step 304 a: The first UE determines a first offset of the firsttransmission bandwidth according to the location of the firsttransmission bandwidth and a size of the bandwidth of the first UE,where the first offset is used to indicate a location offset of thefirst transmission bandwidth in the bandwidth of the first UE.

Step 304 b: The first UE receives, over the first transmissionbandwidth, first location information sent by the base station, wherethe first location information is used to determine a location of secondcommon information in the bandwidth of the UE.

Step 304 c: The first UE determines a first location of the secondcommon information according to the first location information and thefirst offset, where the first location is located in the firsttransmission bandwidth.

Step 304 d: The first UE receives, at the first location, the secondcommon information sent by the base station.

Step 305 a: The first UE receives, over the first transmissionbandwidth, second location information sent by the base station, wherethe second location information is used to indicate a location of thesecond common information in the first transmission bandwidth.

Step 305 b: The first UE determines a second location of the secondcommon information according to the second location information, wherethe second location is located in the first transmission bandwidth.

Step 305 c: The first UE receives, at the second location, the secondcommon information sent by the base station.

In step 301, the first UE obtains the frequency domain locationinformation of the first transmission bandwidth, where the firsttransmission bandwidth is M PRBs in the bandwidth of the first UE.Preferably, the first transmission bandwidth may be formed by the Mconsecutive PRBs overlapping between the bandwidth of first UE and thebandwidth of the second UE

The size of the first transmission bandwidth is less than the size ofthe bandwidth of the first UE (that is, the first transmission bandwidthis located in the bandwidth of the first UE). Similarly, the size of thefirst transmission bandwidth is also less than a size of the bandwidthof the second UE. Further, the UE may receive the frequency domainlocation information that is of the first transmission bandwidth andthat is semi-statically transmitted by the base station, or the UE mayperform blind detection by extracting a characteristic signal from thefirst transmission bandwidth in order to determine the frequency domainlocation information of the first transmission bandwidth.

In step 302, after obtaining the frequency domain location informationof the first transmission bandwidth, the first UE determines the sizeand the location of the first transmission bandwidth in the bandwidth ofthe first UE according to the frequency domain location information.

For example, after obtaining the frequency domain location informationof the first transmission bandwidth, the first UE determines, accordingto the frequency domain location information, 15 consecutive PRBs fromthe 10^(th) PRB to the 24^(th) PRB in the standard bandwidth of thefirst UE as a location of the first transmission bandwidth in thestandard bandwidth of the first UE. After obtaining the frequency domainlocation information of the first transmission bandwidth, the second UEdetermines, according to the frequency domain location information, 15consecutive PRBs from the 0^(th) to the 14^(th) PRBs in the standardbandwidth of the second UE as a location of the first transmissionbandwidth in the standard bandwidth of the second UE.

It may be seen that the standard bandwidths of the first UE and thesecond UE both include the first transmission bandwidth, but the firsttransmission bandwidth is located in different locations in therespective standard bandwidths of the first UE and the second UE.

Preferably, the size of the first transmission bandwidth may be astandard bandwidth already defined in an LTE system, that is, 1.4 MHz, 3MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz. Preferably, a frequency domainstructure of the first transmission bandwidth may also be the same as afrequency domain structure of a bandwidth having a size the same as thesize of the first transmission bandwidth in the LTE system. In this way,the base station does not need to modify an existing configurationparameter for the first UE, and even, the first UE may be directlyconnected to the LTE system over the first transmission bandwidth suchthat the first UE may directly serve the UE over the first transmissionbandwidth, thereby improving compatibility of the LTE system.

After step 302 is performed, the first UE may receive, over thedetermined first transmission bandwidth, the common information sent bythe base station. The common information may be classified into threetypes. Common information sent by the base station in an entirebandwidth of the UE is first common information, such as informationtransmitted using a PCFICH, a PHICH, a common PDCCH, or a common EPDCCH.Common information sent by the base station over a part of the bandwidthafter the base station dynamically performs resource configuration inthe entire bandwidth of the UE is second common information, such as anSIB, an RAR, or paging information. In addition, common information sentby the base station over a bandwidth at a specified location in theentire bandwidth of the UE is third common information, such as an MIB,a PSS, an SSS, or a DRS. For example, the MIB, the PSS, or the SSS maybe sent on 72 subcarriers in a center of the first transmissionbandwidth, the PSS or the SSS in the DRS may be sent on 72 subcarriersin the center of the first transmission bandwidth, and a channel stateinformation-reference signal (CSI-RS) in the DRS may be sent on all PRBsof the first transmission bandwidth.

It may be seen that, because transmission of the second commoninformation needs to be dynamically configured by the base station, thisembodiment of the present disclosure provides two methods for receivingthe second common information, that is, step 304 a to step 304 d andstep 305 a to step 305 c. When the first UE receives, over the firsttransmission bandwidth, the first common information or the third commoninformation sent by the base station, step 303 may be performed.

In step 303, after separately determining sizes and locations of thefirst transmission bandwidth in the respective bandwidths of the firstUE and the second UE, the first UE and the second UE both receives, overthe first transmission bandwidth, the first common information or thethird common information sent by the base station. In this way, the basestation may deliver the first common information or the third commoninformation at once, thereby avoiding problems that because the basestation separately sends the common information to the first UE and thesecond UE, a communication rate is decreased and signalling overheads ofthe base station are increased. In addition, because the firsttransmission bandwidth is configured in each UE to receive the firstcommon information or the third common information sent by the basestation, no conflict occurs between bandwidth resources used by the UEs,and the base station may separately serve each UE, thereby improvingcommunication performance between the base station and the UEs.

In step 304 a, because transmission of the second common informationneeds to be dynamically configured by the base station, afterdetermining the size and the location of the first transmissionbandwidth in the bandwidth of the first UE, the first UE may determinethe first offset of the first UE according to the location of the firsttransmission bandwidth and the size of the bandwidth of the first UE,where the first offset is used to indicate the location offset of thefirst transmission bandwidth in the bandwidth of the first UE.

For example, if a size of the standard bandwidth of the first UE is 5MHz (that is, PRBs numbered from 0 to 24), and the location of the firsttransmission bandwidth in the standard bandwidth of the first UE is fromthe 10^(th) PRB to the 24^(th) PRB, the first offset is 10 PRBs.

In addition, the first UE and/or the second UE may also directlydetermine, by receiving the first offset sent by the base station, alocation offset of the first transmission bandwidth in the bandwidth ofthe first UE and/or the second UE.

In step 304 b, the first UE receives, over the first transmissionbandwidth, the first location information sent by the base station,where the first location information is used to determine the locationof the second common information in the bandwidth of the UE. Forexample, the first location information sent by the base stationindicates that the base station sends the second common information onthe 0^(th) to the 2^(nd) PRBs of the first transmission bandwidth.

Further, the first location information may be information shared by UEsreceiving the second common information, or the first locationinformation may be information sent to all UEs receiving the secondcommon information.

In step 304 c, after receiving, over the first transmission bandwidth,the first location information sent by the base station, the first UEdetermines the first location of the second common information accordingto the first location information and the first offset, where the firstlocation is located in the first transmission bandwidth.

Still using an example in the foregoing step 304 a and step 304 b, thefirst location information sent by the base station indicates that thebase station sends the second common information on the 0^(th) to the2^(nd) PRBs of the first transmission bandwidth, and the first offset ofthe first UE is 10 PRBs. Therefore, the first location (that is, anactual resource location) of the second common information in thebandwidth of the first UE is the 10^(th) to the 12^(th) PRBs in thebandwidth of the first UE.

Similarly, the second UE may also use the same method to determine afirst location of the second common information in the bandwidth of thesecond UE. For example, if first location information sent by the basestation to the second UE indicates that the base station sends thesecond common information on the 0^(th) to the 2^(nd) PRBs of the firsttransmission bandwidth, and a first offset for the second UE is 9 PRBs,for the second UE, the first location at which the second UE receivesthe second common information in the bandwidth of the second UE is the9^(th) to the 11^(th) PRBs in the bandwidth of the second UE. However,in the first transmission bandwidth, a location of the 9^(th) to the11^(th) PRBs in the bandwidth of the second UE is the same as a locationof the 10^(th) to the 12^(th) PRBs in the bandwidth of the first UE, andboth locations are the 0^(th) to the 2^(nd) PRBs of the firsttransmission bandwidth. Therefore, it may be seen that although thefirst UE and the second UE receive the second common information atdifferent locations in respective bandwidths of the first UE and thesecond UE, for the base station, the first location at which the secondUE receives the second common information and the first location atwhich the first UE receives the second common information are actuallythe 0^(th) to the 2^(nd) PRBs of the first transmission bandwidth.Therefore, the base station may deliver the second common information atonce in order to ensure that the first UE and the second UE both receivethe second common information.

In step 304 d, after determining the first location of the second commoninformation, the first UE receives, at the first receiving location, thesecond common information sent by the base station.

Correspondingly, after the second UE determines an actual resourcelocation of the second common information in the bandwidth of the secondUE, the second UE receives, at the actual resource location, the secondcommon information sent by the base station. Because actual resourcelocations at which the second common information is received and thatare determined by the first UE and the second UE are the same, the basestation may deliver the second common information to the first UE andthe second UE at the same time, thereby reducing resource overheads on aside of the base station.

In step 305 a, when receiving the second common information sent by thebase station, the first UE does not need to determine the first offset,but performs resource division based on a resource granularity of agiven size according to a requirement. For example, a 3 MHz firsttransmission bandwidth is divided into 15 PRBs according to agranularity of the PRB.

In this way, the first UE may directly receive, over the firsttransmission bandwidth, the second location information that is of thesecond common information and that is sent by the base station, wherethe second location information is used to indicate a receiving locationof the second common information in the first transmission bandwidth.For example, location information of the second common informationindicates that the first UE receives the second common information overa second transmission sub-bandwidth of the first transmission bandwidth.

Certainly, there are multiple methods for performing resource divisionover the first transmission bandwidth based on a resource granularity ofa given size according to a requirement, and this is not limited in thepresent disclosure. Optionally, a method for performing resourcedivision over the first transmission bandwidth may use a bandwidthresource division method of the first UE in order to improvecompatibility of the LTE system.

In step 305 b, the first UE determines the second location of the secondcommon information according to the second location information, wherethe second location is located in the first transmission bandwidth.

Similarly, the second UE may also use the foregoing method to determinethe location (that is, an actual receiving location in the firsttransmission bandwidth) of the second common information in the secondUE, and for the base station, the second location at which the second UEreceives the second common information is actually the same as thesecond location at which the first UE receives the second commoninformation.

In step 305 c, when determining the second location of the second commoninformation in the first transmission bandwidth, the first UE mayreceive, at the second receiving location, the second common informationsent by the base station.

It may be seen that the base station may perform the method in step 304a to step 304 d or step 305 a to step 305 c to deliver the second commoninformation to multiple UEs at the same time, thereby reducingsignalling overheads of the base station.

Further, after receiving, over the first transmission bandwidth, thecommon information sent by the base station, the first UE may also sendcorresponding uplink information to the base station.

Because a resource used by the first UE to receive the commoninformation (that is, downlink information) sent by the base station anda resource used by the first UE to send the uplink information to thebase station need to satisfy a particular mapping relationship (forexample, if the first UE uses the X^(th) PRB to receive the downlinkinformation, the first UE uses the (X+Y)^(th) PRB to send thecorresponding uplink information, where X and Y are integers. It shouldbe noted that the mapping relationship is not limited thereto, and thisis not limited in the present disclosure.), when UE that receives thedownlink information over the first transmission bandwidth and UE thatdoes not receive the downlink information over the first transmissionbandwidth send the uplink information, a conflict may occur betweenbandwidth resources (that is, uplink resource locations).

In this case, the first UE may determine a second offset according toinformation that is about the second offset and that is sent by the basestation, where the second offset is used to determine a relativelocation that is of a frequency domain location used to transmit theuplink information and that is in the bandwidth of the first UE. Thenthe first UE may determine, according to a resource location of thereceived common information and the second offset, an uplink resourcelocation at which the first UE sends the uplink information to the basestation. Finally, the first UE may send the uplink information to thebase station at the uplink resource location. In this way, multiple UEsthat receive the second common information over the first transmissionbandwidth may determine, according to different second offsets, uplinkresource locations used for sending respective uplink information of themultiple UEs, thereby ensuring that no conflict occurs between uplinkresource locations used by various types of UEs to send respectiveuplink information of the UEs to the base station.

In the common information transmission method provided in thisembodiment of the present disclosure, UE obtains frequency domainlocation information of a first transmission bandwidth, and determines asize and a location of the first transmission bandwidth in a bandwidthof the UE, and then a base station sends common information to the UEover the first transmission bandwidth. In this way, when the firsttransmission bandwidth is located in an overlapping part of bandwidthsof multiple UEs, the base station may deliver the common information tothe multiple UEs at once. That is, the base station may send the commoninformation to the multiple UEs at the same time in a sharing manner,thereby avoiding problems that because the base station needs toseparately send the common information to each UE, a communication rateis decreased and signalling overheads of the base station are increased.

Embodiment 4

As shown in FIG. 6 , FIG. 6 is a schematic structural diagram of a UEaccording to this embodiment of the present disclosure. The UE includesa processing unit 11 configured to obtain frequency domain locationinformation of a first transmission bandwidth, and determine a size anda location of the first transmission bandwidth in a bandwidth of the UEaccording to the frequency domain location information, where thebandwidth of the UE is one of system bandwidths, and a receiving unit 12configured to receive, over the first transmission bandwidth accordingto the size and the location of the first transmission bandwidth thatare determined by the processing unit 11, common information sent by abase station.

Optionally, the processing unit 11 used in this embodiment of thepresent disclosure may be a processor in the UE, and the receiving unit12 may be any communications interface in the UE. The processor and thecommunications interface may be connected to and communicate with eachother using a bus. The processor is a control center of the UE. Theprocessor performs various functions of the UE by processing datareceived by the communications interface. The communications interfacemay be implemented using an optical communications interface, anelectrical communications interface, a wireless communicationsinterface, or any combination thereof. For example, the opticalcommunications interface may be a small form-factor pluggable (SFP)communications interface (for example, a transceiver), an enhanced SFP(SFP+) communications interface, or a 10 Gigabit SFP (XFP)communications interface. The electrical communications interface may bean Ethernet network interface controller (NIC). The wirelesscommunications interface may be a wireless NIC (WNIC). In addition, theUE may have multiple communications interfaces.

Further, the common information received by the receiving unit 12includes at least one of the common information, first commoninformation, second common information, or third common information,where the first common information includes information transmittedusing a PCFICH, a PHICH, a PDCCH, or an EPDCCH, or the second commoninformation includes at least one of an SIB, an RAR, or paginginformation, or the third common information includes at least one of anMIB, a PSS, an SSS, or a DRS.

Further, that the processing unit 11 obtains the frequency domainlocation information of the first transmission bandwidth may furtherinclude the receiving unit 12 being further configured to receive thefrequency domain location information that is of the first transmissionbandwidth and that is semi-statically transmitted by the base station,and the processing unit 11 being further configured to obtain thefrequency domain location information of the first transmissionbandwidth using the receiving unit 12, or that the processing unit 11obtains the frequency domain location information of the firsttransmission bandwidth may further include that the receiving unit 12being further configured to extract a characteristic signal from thefirst transmission bandwidth by means of blind detection, and theprocessing unit 11 being further configured to determine the frequencydomain location information of the first transmission bandwidthaccording to the characteristic signal in the receiving unit 12, wherethe characteristic signal is used to reflect the size and the locationof the first transmission bandwidth.

The bandwidth of the UE overlaps a bandwidth of at least one UE of otherUEs, and the first transmission bandwidth is all or a part of theoverlapping part. In this way, multiple UEs may receive, over the firsttransmission bandwidth at the same time, the common information sent bythe base station. That is, the base station may deliver multiple piecesof common information to multiple UEs at once, thereby avoiding problemsthat because the base station separately sends the common information toeach UE, a communication rate is decreased and signalling overheads ofthe base station are increased. In addition, because the firsttransmission bandwidth is configured in each UE to receive the commoninformation sent by the base station, no conflict occurs betweenbandwidth resources used by the UEs, and the base station may separatelyserve each UE (that is, standalone), thereby improving communicationperformance between the base station and the UEs.

Further, that the UE receives, over the first transmission bandwidthaccording to the size and the location of the first transmissionbandwidth, the second common information sent by the base stationincludes that the receiving unit 12 being further configured to receivefirst location information that is of the second common information andthat is sent by the base station, where the first location informationis used to determine a receiving location of the second commoninformation in the bandwidth of the UE, the processing unit 11 beingfurther configured to determine a first location of the second commoninformation according to the first location information in the receivingunit 12 and a first offset, where the first location is located in thefirst transmission bandwidth, and the first offset is used to indicate alocation offset of the first transmission bandwidth in the bandwidth ofthe UE, and the receiving unit 12 being further configured to receive,at the first location in the processing unit 11, the second commoninformation sent by the base station.

The receiving unit 12 is further configured to receive the first offsetsent by the base station.

Optionally, the UE may also include a memory (not shown). The memory,the processor, and the communications interface are connected to andcommunicate with each other using the bus. Further, the memory may beconfigured to store the first offset received by the receiving unit 12such that the processor determines, by invoking the first offset storedin the memory, the first location of the second common informationaccording to the first location information received by the receivingunit 12 and the stored first offset.

Further, the processing unit 11 is further configured to determine thefirst offset according to the frequency domain location information.

Similarly, that the UE receives, over the first transmission bandwidthaccording to the size and the location of the first transmissionbandwidth, the second common information sent by the base station mayfurther include that the receiving unit 12 being further configured toreceive second location information that is of the second commoninformation and that is sent by the base station, where the secondlocation information is used to indicate a receiving location of thesecond common information in the first transmission bandwidth, theprocessing unit 11 being further configured to determine a secondlocation of the second common information according to the secondlocation information of the second common information in the receivingunit 12, where the second location is located in the first transmissionbandwidth, and the receiving unit 12 being further configured toreceive, at the second location in the processing unit 11, the secondcommon information sent by the base station.

Further, as shown in FIG. 7 , the UE further includes a sending unit 13.Further, the receiving unit 12 is further configured to receiveinformation that is about a second offset and that is sent by the basestation, where the second offset is used to indicate a location offsetthat is of a frequency domain location used to transmit uplinkinformation and that is in the bandwidth of the UE. The processing unit11 is further configured to determine, according to a resource locationat which the common information is received and the information aboutthe second offset in the receiving unit 12, an uplink resource locationat which the UE sends the uplink information to the base station, andthe sending unit 13 is configured to send the uplink information at theuplink resource location determined in the processing unit 11.

Optionally, the sending unit 13 may also be one of the foregoing anycommunications interface. This is not limited in the present disclosure.

In the UE provided in this embodiment of the present disclosure, the UEobtains frequency domain location information of a first transmissionbandwidth, and determines a size and a location of the firsttransmission bandwidth in a bandwidth of the UE, and then a base stationsends common information to the UE over the first transmissionbandwidth. In this way, when the first transmission bandwidth is locatedin an overlapping part of bandwidths of multiple UEs, the base stationmay deliver the common information to the multiple UEs at once. That is,the base station may send the common information to the multiple UEs atthe same time in a sharing manner, thereby avoiding problems thatbecause the base station needs to separately send the common informationto each UE, a communication rate is decreased and signalling overheadsof the base station are increased.

Embodiment 5

As shown in FIG. 8 , FIG. 8 is a schematic structural diagram of a basestation according to this embodiment of the present disclosure. The basestation includes a processing unit 21 configured to determine a size anda location of a first transmission bandwidth in a bandwidth of the basestation, and a sending unit 22 configured to send common information toUE over the first transmission bandwidth according to the size and thelocation of the first transmission bandwidth in the bandwidth of thebase station that are determined by the processing unit 21.

Optionally, the processing unit 21 used in this embodiment of thepresent disclosure may be a processor in the base station, and thesending unit 22 may be any communications interface in the base station.The processor and the communications interface may be connected to andcommunicate with each other using a bus. The processor is a controlcenter of the base station. The processor performs various functions ofthe UE by processing data received by the communications interface. Thecommunications interface may be implemented using an opticalcommunications interface, an electrical communications interface, awireless communications interface, or any combination thereof. Forexample, the optical communications interface may be an SFPcommunications interface (such as a transceiver), an SFP+ communicationsinterface, or an XFP communications interface. The electricalcommunications interface may be an Ethernet NIC. The wirelesscommunications interface may be a WNIC. In addition, the base stationmay have multiple communications interfaces.

Further, the common information sent by the sending unit 22 includes atleast one of the common information, first common information, secondcommon information, or third common information, where the first commoninformation includes information transmitted using a PCFICH, a PHICH, aPDCCH, or an EPDCCH, or the second common information includes at leastone of an SIB, an RAR, or paging information, or the third commoninformation includes at least one of an MIB, a PSS, an SSS, or a DRS.

Further, after the processing unit 21 determines the size and thelocation of the first transmission bandwidth in the bandwidth of thebase station, the sending unit 22 is further configured tosemi-statically transmit frequency domain location information to theUE, where the frequency domain location information is used to determinea size and a location of the first transmission bandwidth in a bandwidthof the UE, or the sending unit 22 is further configured to send acharacteristic signal to the UE, where the characteristic signal is usedto determine a size and a location of the first transmission bandwidthin a bandwidth of the UE.

The bandwidth of the UE overlaps a bandwidth of at least one UE of otherUEs, and the first transmission bandwidth is all or a part of theoverlapping part. In this way, multiple UEs may receive, over the firsttransmission bandwidth at the same time, the common information sent bythe base station. That is, the base station may deliver multiple piecesof common information to multiple UEs at once, thereby avoiding problemsthat because the base station separately sends the common information toeach UE, a communication rate is decreased and signalling overheads ofthe base station are increased. In addition, because the firsttransmission bandwidth is configured in each UE to receive the commoninformation sent by the base station, no conflict occurs betweenbandwidth resources used by the UEs, and the base station may separatelyserve each UE (that is, standalone), thereby improving communicationperformance between the base station and the UEs.

Further, that the sending unit 22 sends the second common information tothe UE over the first transmission bandwidth further includes that thesending unit 22 being further configured to send first locationinformation to the UE, where the first location information is used todetermine a first location of the second common information, theprocessing unit 21 being further configured to determine the firstlocation according to the first location information in the sending unit22 and a first offset, where the first location is located in the firsttransmission bandwidth, and the first offset is used to indicate alocation offset of the first transmission bandwidth in the bandwidth ofthe UE, and the sending unit 22 being further configured to send thesecond common information to the UE according to the first locationdetermined in the processing unit 21.

Similarly, that the sending unit 22 sends the second common informationto the UE over the first transmission bandwidth may further include thatthe sending unit 22 being further configured to send second locationinformation to the UE, where the second location information is used toindicate a second location of the second common information in the firsttransmission bandwidth, the processing unit 21 being further configuredto determine the second location according to the second locationinformation in the sending unit 22, where the second location is locatedin the first transmission bandwidth, and the sending unit 22 beingfurther configured to send the second common information to the UEaccording to the second location determined in the processing unit 21.

The sending unit 22 is further configured to send information about asecond offset to the UE, where the second offset is used to indicate alocation offset that is of a frequency domain location used to transmituplink information and that is in the bandwidth of the UE.

In the base station provided in this embodiment of the presentdisclosure, the UE obtains frequency domain location information of afirst transmission bandwidth, and determines a size and a location ofthe first transmission bandwidth in a bandwidth of the UE, and then thebase station sends common information to the UE over the firsttransmission bandwidth. In this way, when the first transmissionbandwidth is located in an overlapping part of bandwidths of multipleUEs, the base station may deliver the common information to the multipleUEs at once. That is, the base station may send the common informationto the multiple UEs at the same time in a sharing manner, therebyavoiding problems that because the base station needs to separately sendthe common information to each UE, a communication rate is decreased andsignalling overheads of the base station are increased.

This specification describes various aspects with reference to aterminal and/or a base station.

The UE may be a wireless terminal or a wired terminal. The wirelessterminal may refer to a device that provides a user with voice and/ordata connectivity, a handheld device with a radio connection function,or another processing device connected to a radio modem. The wirelessterminal may communicate with one or more core networks through a radioaccess network (RAN). The wireless terminal may be a mobile terminal,such as a mobile phone (also referred to as a “cellular” phone) and acomputer with a mobile terminal, for example, may be a portable,pocket-sized, handheld, computer built-in, or in-vehicle mobileapparatus, which exchanges voice and/or data with the RAN. For example,it may be a device such as a personal communication service (PCS) phone,a cordless telephone set, a Session Initiation Protocol (SIP) phone, awireless local loop (WLL) station, or a personal digital assistant(PDA). The wireless terminal may also be called a system, a subscriberunit, a subscriber station, a mobile station, a mobile terminal, aremote station, an access point, a remote terminal, an access terminal,a user terminal, a user agent, a user device, or UE.

The base station (for example, an access point) may refer to a device incommunication with a wireless terminal via one or more sectors at an airinterface in an access network. The base station may be configured tomutually convert a received over-the-air frame and an Internet protocol(IP) packet and serve as a router between the wireless terminal and arest portion of the access network, where the rest portion of the accessnetwork may include an IP network. The base station may coordinateattribute management of the air interface. For example, the base stationmay be a base transceiver station (BTS) in global system for mobilecommunication (GSM) or code division multiple access (CDMA), may also bea NodeB in wide band CDMA (WCDMA), and may further be an evolved NodeB(eNB or e-NodeB,) in the LTE, which is not limited in the presentdisclosure.

It may be clearly understood by a person skilled in the art that, forthe purpose of convenient and brief description, division of theforegoing function modules is taken as an example for illustration. Inactual application, the foregoing functions can be allocated todifferent function modules and implemented according to a requirement,that is, an inner structure of an apparatus is divided into differentfunction modules to implement all or some of the functions describedabove. For a detailed working process of the foregoing system,apparatus, and unit, reference may be made to a corresponding process inthe foregoing method embodiments, and details are not described hereinagain.

In the several embodiments provided in this application, it should beunderstood that the disclosed system, apparatus, and method may beimplemented in other manners. For example, the described apparatusembodiment is merely an example. For example, the module or unitdivision is merely logical function division and may be other divisionin actual implementation. For example, a plurality of units orcomponents may be combined or integrated into another system, or somefeatures may be ignored or not performed. In addition, the displayed ordiscussed mutual couplings or direct couplings or communicationconnections may be implemented using some interfaces. The indirectcouplings or communication connections between the apparatuses or unitsmay be implemented in electronic, mechanical, or other forms.

The units described as separate parts may or may not be physicallyseparate, and parts displayed as units may or may not be physical units,may be located in one location, or may be distributed on a plurality ofnetwork units. Some or all of the units may be selected according toactual needs to achieve the objectives of the solutions of theembodiments.

In addition, functional units in the embodiments of the presentdisclosure may be integrated into one processing unit, or each of theunits may exist alone physically, or two or more units are integratedinto one unit. The integrated unit may be implemented in a form ofhardware, or may be implemented in a form of a software functional unit.

When the integrated unit is implemented in the form of a softwarefunctional unit and sold or used as an independent product, theintegrated unit may be stored in a computer-readable storage medium.Based on such an understanding, the technical solutions may beimplemented in the form of a software product. The software product isstored in a storage medium and includes several instructions forinstructing a computer device (which may be a personal computer, aserver, or a network device) or a processor to perform all or a part ofthe steps of the methods described in the embodiments of the presentdisclosure. The foregoing storage medium includes any medium that canstore program code, such as a universal serial bus (USB) flash drive, aremovable hard disk, a read-only memory (ROM), a random access memory(RAM), a magnetic disk, or an optical disc.

The foregoing descriptions are merely example implementation manners ofthe present disclosure, but are not intended to limit the protectionscope of the present disclosure. Any variation or replacement readilyfigured out by a person skilled in the art within the technical scopedisclosed in the present disclosure shall fall within the protectionscope of the present disclosure. Therefore, the protection scope of thepresent disclosure shall be subject to the protection scope of theclaims.

What is claimed is:
 1. A method, comprising: obtaining, by a userequipment (UE), frequency domain location information of a firsttransmission bandwidth; determining, by the UE, a size and a location ofthe first transmission bandwidth in a bandwidth of the UE according tothe frequency domain location information, wherein the bandwidth of theUE is within a bandwidth of a base station; receiving, by the UE, secondlocation information within the first transmission bandwidth from thebase station, wherein the second location information indicates alocation of common information in the first transmission bandwidth;determining, by the UE, the location of common information according tothe second location information, wherein the location of commoninformation is in the first transmission bandwidth; and receiving, bythe UE at the location of common information, common information fromthe base station, wherein the common information is a system informationblock (SIB), a random access response (RAR), or paging information. 2.The method of claim 1, wherein the first transmission bandwidth is allor part of an overlapping part between the bandwidth of the UE and asecond bandwidth of a second UE.
 3. The method of claim 1, furthercomprising: receiving, by the UE, information from the base station thatis about a second offset, wherein the second offset indicates a locationoffset that is of a frequency domain location used to transmit uplinkinformation and that is in the bandwidth of the UE; determining, by theUE according to a resource location at which the common information isreceived and the information about the second offset, an uplink resourcelocation at which the UE sends the uplink information to the basestation; and sending, by the UE at the uplink resource location, theuplink information to the base station.
 4. The method of claim 1,wherein there is a first offset between a starting PRB of the firsttransmission bandwidth and a starting PRB of the bandwidth of the UE. 5.The method of claim 1, wherein the bandwidth of the UE at leastpartially overlaps a second bandwidth of a second UE to which the basestation sends the common information.
 6. The method of claim 1, whereinthe size of the first transmission bandwidth is less than a size of thebandwidth of the UE.
 7. The method of claim 1, wherein determining, bythe UE, the location of common information according to the secondlocation information comprises determining, by the UE, the location ofcommon information according to the second location information and thesize and location of the first transmission bandwidth.
 8. The method ofclaim 1, wherein the first transmission bandwidth is formed by Mconsecutive physical resource blocks (PRBs).
 9. The method of claim 1,wherein the bandwidth of the UE is 5 megahertz (MHz), 10 MHz, 15 MHz, or20 MHz.
 10. The method of claim 1, wherein the location of the commoninformation in the first transmission bandwidth is dynamicallyconfigured.
 11. A method, comprising: determining, by a base station, asize and a location of a first transmission bandwidth in a bandwidth ofthe base station; sending, by the base station and to a user equipment(UE), frequency domain location information of the first transmissionbandwidth, wherein the frequency domain location information indicatesthe size and the location of the first transmission bandwidth, andwherein the first transmission bandwidth is within a bandwidth of the UEand the bandwidth of the UE is within the bandwidth of the base station;sending, by the base station and to the UE, second location informationwithin the first transmission bandwidth, wherein the second locationinformation indicates a location of common information in the firsttransmission bandwidth; and sending, by the base station, commoninformation to the UE at the location of common information, wherein thecommon information is a system information block (SIB), a random accessresponse (RAR), or paging information.
 12. The method of claim 11,further comprising simultaneously sending, by the base station, thecommon information to the UE and at least a second UE when the bandwidthof the UE at least partially overlaps a second bandwidth of the secondUE.
 13. The method of claim 11, wherein there is a first offset betweena starting PRB of the first transmission bandwidth and a starting PRB ofthe bandwidth of the UE.
 14. The method of claim 11, wherein the size ofthe first transmission bandwidth is less than a size of the bandwidth ofthe UE.
 15. The method of claim 11, wherein the first transmissionbandwidth is formed by M consecutive physical resource blocks (PRBs).16. The method of claim 11, wherein the bandwidth of the UE is 1.4megahertz (MHz), 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz.
 17. The methodof claim 11, wherein the location of the common information in the firsttransmission bandwidth is dynamically configured.
 18. An apparatus,comprising: one or more processors; and a non-transitory storage mediumcoupled to the one or more processors and configured to store programinstructions that, when executed by the one or more processors, causethe apparatus to: obtain frequency domain location information of afirst transmission bandwidth; determine a size and a location of thefirst transmission bandwidth in a bandwidth of a user equipment (UE)according to the frequency domain location information, wherein thebandwidth of the UE is within a bandwidth of a base station; receivesecond location information within the first transmission bandwidth fromthe base station, wherein the second location information indicates alocation of common information in the first transmission bandwidth;determine the location of common information according to the secondlocation information, wherein the location of common information is inthe first transmission bandwidth; and receive, at the location of commoninformation, common information from the base station, wherein thecommon information is a system information block (SIB), a random accessresponse (RAR), or paging information.
 19. The apparatus of claim 18,wherein the first transmission bandwidth is all or part of anoverlapping part between the bandwidth of the UE and a second bandwidthof a second UE.
 20. The apparatus of claim 18, wherein there is a firstoffset between a starting PRB of the first transmission bandwidth and astarting PRB of the bandwidth of the UE.
 21. The apparatus of claim 18,wherein the bandwidth of the UE at least partially overlaps a secondbandwidth of a second UE to which the base station sends the commoninformation.
 22. The apparatus of claim 18, wherein the size of thefirst transmission bandwidth is less than a size of the bandwidth of theUE.
 23. The apparatus of claim 18, wherein the apparatus is configuredto determine the location of common information according to the secondlocation information and the size and location of the first transmissionbandwidth.
 24. The apparatus of claim 18, wherein the bandwidth of theUE is 1.4 megahertz (MHz), 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz. 25.The apparatus of claim 18, wherein the location of the commoninformation in the first transmission bandwidth is dynamicallyconfigured.
 26. An apparatus, comprising: one or more processors; and anon-transitory storage medium coupled to the one or more processors andconfigured to store program instructions that, when executed by the oneor more processors, cause the apparatus to: determine a size and alocation of a first transmission bandwidth in a bandwidth of a basestation; send, to a user equipment (UE), frequency domain locationinformation of the first transmission bandwidth, wherein the frequencydomain location information indicates the size and the location of thefirst transmission bandwidth, and wherein the first transmissionbandwidth is within a bandwidth of the UE and the bandwidth of the UE iswithin the bandwidth of the base station; send, to the UE, secondlocation information within the first transmission bandwidth, whereinthe second location information indicates a location of commoninformation in the first transmission bandwidth; and send commoninformation to the UE at the location of common information, wherein thecommon information is a system information block (SIB), a random accessresponse (RAR), or paging information.
 27. The apparatus of claim 26,wherein the program instructions, when executed by the one or moreprocessors, further cause the apparatus to send the common informationto the UE and at least a second UE when the bandwidth of the UE at leastpartially overlaps a second bandwidth of the second UE.
 28. Theapparatus of claim 26, wherein there is a first offset between astarting PRB of the first transmission bandwidth and a starting PRB ofthe bandwidth of the UE.
 29. The apparatus of claim 26, wherein thefirst transmission bandwidth is formed by M consecutive physicalresource blocks (PRBs).
 30. The apparatus of claim 26, wherein the sizeof the first transmission bandwidth is less than a size of the bandwidthof the UE.
 31. The apparatus of claim 26, wherein the bandwidth of theUE is 5 megahertz (MHz), 10 MHz, 15 MHz, or 20 MHz.
 32. The apparatus ofclaim 26, wherein the location of the common information in the firsttransmission bandwidth is dynamically configured.